Restructuring (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 27, 2017
Restructuring Cost and Reserve [Line Items]
Business acquisition, percentage of voting interests acquired		20.00%	20.00%
Restructuring Reserve [Roll Forward]
Provision	$ 31	$ 14	$ 13	$ 14	$ 23	$ 6	$ 31	$ 8	$ 72	$ 67	$ 58
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance				25				5	25	5
Provision									44	42
Cash payments									(35)	(22)
Restructuring reserve, ending balance	34				25				34	25	5
Corporate Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Provision									6
Sevcon, Inc [Member]
Restructuring Cost and Reserve [Line Items]
Business acquisition, percentage of voting interests acquired												100.00%
Engine [Member] | Reduce structural costs [Member]
Restructuring Reserve [Roll Forward]
Provision									5
Engine [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance				21				1	21	1
Provision									43	35
Cash payments									(34)	(15)
Restructuring reserve, ending balance	30				21				$ 30	21	1
Restructuring and Related Cost, Number of Positions Eliminated | employee									350
Engine [Member] | Employee Severance [Member] | Reduce structural costs [Member]
Restructuring Reserve [Roll Forward]
Provision									$ 37
Engine [Member] | Professional Fees, Employee Termination and Relocation Costs [Member]
Restructuring Reserve [Roll Forward]
Provision									18	54
Emissions [Member] | Professional Fees, Employee Termination and Relocation Costs [Member]
Restructuring Reserve [Roll Forward]
Provision											48
Drivetrain [Member]
Restructuring Reserve [Roll Forward]
Provision										7
Drivetrain [Member] | Reduce structural costs [Member]
Restructuring Reserve [Roll Forward]
Provision									6
Drivetrain [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 4				$ 4	4	4
Provision									1	7
Cash payments									(1)	(7)
Restructuring reserve, ending balance	$ 4				$ 4				4	4	$ 4
Drivetrain [Member] | Manufacturing Footprint Rationalization Activities [Member]
Restructuring Reserve [Roll Forward]
Provision									$ 10
Europe | Engine [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Provision										$ 28
Europe | Engine [Member] | Professional Fees, Employee Termination and Relocation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Number of Positions Eliminated | employee									140
Non-Europe [Member] | Engine [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Provision									$ 6